They are made by elkay plastics. I have lots of these. They are 2mil and close on top.
Item Tag: Elkay
1000 6 x 9 specimen bag with absorbant pad Lab-loc LABZ69BA
The bags have a special removable biohazard symbol which can be torn off and allows the bags to be disposed of with regular waste if they are uncontaminated. Tommy room. GraduationsWithout Graduations.